If Trust = f (Integrity + Reliability + Competence), then we need to assure we have a fact-based way to measure each component for our staff.
Take "Competence" for individuals in your group of Structural Engineers.
Consider a simple scale, e.g., 3, "Walks on water," 2, "A strong swimmer," and 1, "Needs to stay in the shallow end of the pool." And depending on the specific structural engineering task, we would expect each person to have a mix of strengths.
*How Do You Know?